I've been through the steps a good 4 times now and cannot reproduce it. I also use Vista SP1, so in hopes of beating the "OMG it's Vista's fault" crowd to the punch, this appears to have more to do with your specific machine setup. Is there any more information you can share with us to help pin this down?

If you are CERTAIN that it is the Dropshadow object, maybe you can do it the old fashioned way (make a "shadow" sprite and put it under/offset of the players)Edit: because if it isnt then it is just Construct itself that is crashing

"Construct 4 lets YOU make advanced games! (but not play them)"Construct Classic - Examples Kit Dropbox is a pile of trash and if you need my old files PM me! :)